100 lines
2.4 KiB
Ruby
100 lines
2.4 KiB
Ruby
module Mutant
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module Repository
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# Error raised on repository interaction problems
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RepositoryError = Class.new(RuntimeError)
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# Subject filter based on repository diff
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class SubjectFilter
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include Adamantium, Concord.new(:diff)
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# Test if subject was touched in diff
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#
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# @param [Subject] subject
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#
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# @return [Boolean]
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#
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# @api private
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def call(subject)
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diff.touches?(subject.source_path, subject.source_lines)
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end
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end # SubjectFilter
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# Diff between two objects in repository
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class Diff
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include Adamantium, Concord.new(:from, :to)
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HEAD = 'HEAD'.freeze
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private_constant(*constants(false))
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# Create diff from head to revision
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#
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# @return [Diff]
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#
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# @api private
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def self.from_head(to)
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new(HEAD, to)
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end
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# Test if diff changes file at line range
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#
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# @param [Pathname] path
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# @param [Range<Fixnum>] line_range
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#
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# @return [Boolean]
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#
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# @raise [RepositoryError]
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# when git command failed
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#
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# @api private
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def touches?(path, line_range)
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return false unless within_working_directory?(path) && tracks?(path)
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command = %W[
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git log
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#{from}...#{to}
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-L #{line_range.begin},#{line_range.end}:#{path}
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]
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stdout, status = Open3.capture2(*command, binmode: true)
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fail RepositoryError, "Command #{command} failed!" unless status.success?
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!stdout.empty?
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end
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private
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# Test if path is tracked in repository
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#
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# FIXME: Cache results, to avoid spending time on producing redundant results.
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#
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# @param [Pathname] path
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#
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# @return [Boolean]
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#
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# @api private
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def tracks?(path)
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command = %W[git ls-files --error-unmatch -- #{path}]
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Kernel.system(
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*command,
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out: File::NULL,
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err: File::NULL
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)
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end
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# Test if the path is within the current working directory
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#
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# @param [Pathname] path
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#
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# @return [TrueClass, nil]
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#
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# @api private
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def within_working_directory?(path)
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working_directory = Pathname.pwd
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path.ascend { |parent| return true if working_directory.eql?(parent) }
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end
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end # Diff
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end # Repository
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end # Mutant
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